ΔE 13.9, fair: the same colour family, but not a straight swap. Celestial Violet is noticeably lighter, warmer than Blue Sand.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Celestial Violet is noticeably lighter, warmer than Blue Sand.
The same difference applies the other way round: Blue Sand is noticeably darker, cooler.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Blue Sand on the colour wheel See Celestial Violet on the colour wheel
All matches: Blue Sand equivalents · Celestial Violet equivalents